Olympic Champion Kayla Harrison

09:56

August 15, 2012

Kayla Harrison (in white) competed against Gemma Gibbons of Great Britain (in blue) during the women's 78-kg judo competition at the 2012 Summer Olympics. Harrison won the gold medal. (AP)

Kayla Harrison, of Marblehead, just won the United States' first-ever gold medal in judo at the 2012 London Olympics.

By the time Kayla turned 18, she was already a two-time national champion in the sport of judo. At 20, she became the first U.S. woman to win the World Judo Championship in 26 years. And now, at 22, she's the most decorated judoka in American history.

Guests:

Kayla Harrison, Olympic gold medalist in judo

More:

NBC: Watch Kayla Harrison defeat Gemma Gibbons
Only A Game: Kayla Harrison’s Judo Journey

This segment aired on August 15, 2012.